Portable elevator



March 14, 1944.

G. B. DAVIS PORTABLE ELEVATOR Filed Dec. 28, 1942 2 Sheets-Sheet 1 INVENTOR. BY Geavge 5. P

Arrvmvzy- March 14, 1944. cs. B. DAVIS PORTABLE ELEVATOR Filed Dec. 28, 1942 2 Sheets-Sheet 2 nrmmyzx Patented Mar. 14, 1944 UNITED STATES PATENT OFFICE mmfiffifivma George B. Davis, Pasadena, Calif.

Application December 28, 1942, Serial No. 410,327.

3 Claims. po 254-143) This invention relates to portable elevators.

The general object of the invention is to provide an improved portable elevator which is particularly adapted for use in construction work for raising material from a floor or base to a platform or roof above the base.

An additional object of the invention is to provide an elevator including a novel means for holding a mast in place.

An additional object of the invention is to provide a novel trigger mechanism for supporting a mast.

A further object of the invention is to provide a novel support means for adjustably holding a vertical mast in operative position.

Other objects and advantages of my invention will be apparent from the following description taken in connection with the accompanying drawings wherein: Y Y

Fig. l is a perspective view showing a portable elevator embodying the features of my invention;

Fig. 2 is a side elevation showing the elevator;

Fig. 3 is a fragmentary front elevation showing the trigger mechanism; and v Fig. 4 is an enlarged sectional detail taken on line 4-4, Fig. 3, showing the mast elevating means.

Referring to the drawings by reference char? acters I have shown my invention as embodied in a portable elevator which is indicated generally at I0. As shown, the elevator includes a rectangular base II which includes side members I2 and end members I3. The base is mounted on casters I4 and is provided with a, transverse brace member I5 mounted on the side members I2 On the base I arrange support members I6 and I! which converge upwardly and are connected at their tops by a pair of upper transverse members I8 and I9. The members I8 and I9 are spaced apart to form a slot 29. Inclined brace members 2| are connected to the base and to the transverse member I9. A mast 22 passes through the slot 20 and has a pair of pulleys 23 mounted on brackets 24 at the top thereof.

Between the upper transverse members I8 and I9 and the base I arrange a pair of lower transverse members 25 and 26 on which guide members 21 are arranged to form a slot 28 through which the mast 22 slides.

The mast is provided with a plurality of notches 29 in which I arrange metal wear members 30. The notches 29 are adapted to receive the upper end 3| of a trigger 32 which is pivoted at 33 on the lower transverse members 25 and 26. The

upper end 3| of the trigger is' provided with a metallic-plate 34 to reduce wear. A flexible cable 35. is connected :to the-trigger 32 and pass-over pulley 38 and extends downwardly and is secured to a clip 37'. 'The' cable 35 when pulled moves the upper" end of the trigger outwardly from the associated notch, thus allowing the mast to be adjusted. v

One end 38 of a spring 39 engages the trigger and the other end 40 0f the spring engages'the support member IS; The spring 39 normally urges the triggerto engaged position.

The lower end of the mast 22 is provided with a projecting plate M which extends rearwardly and receives an eye 42- to which 'a cable 43 is attached. The cable 43 engages a pulley 44 which is aligned with a second pulley 45 mounted on a bracket 41 on the upper transverse member I8.

A cable 46 has one end secured at 46a to the ulley 45 and the cable'46 passes downwardly around the pulley 44, upwardly around the pulley 45 and then hangs pendant. The con struction is such that when the cable end 46 is pulled the plate 4| will rise thus lifting the mast 22.

A hoisting cable 48 passes over the pulleys 23 and is shown as provided with a hook 49 for attachment to a load to be lifted. The cable 48 extends downwardly and over a pulley 50 mounted in a bracket 5| which is secured to the brace member I 5. From the pulley 50 the cable extends to a winch 52 which may be rotated by means of a motor 53 mounted on supports 54 secured to a transverse member 55 on the base I I.

In the use of my device the mast is raised or lowered to the correct position by a manipulation of the cables 35 and 46. The hook member is then attached to the object to be lifted and the winch 52 is then actuated.

My elevator is preferably made of lumber which is available on the Job.

My portable elevator is particularly adapted for raising building material to the roof or to the upper floors of buildings under construction. In such use, the mast 22 is lowered and the apparatus is then moved on the casters I4 to the desired location. The mast 22 is then raised as previously described, and when raised may pass through an aperture in the roof or the upper floor so that the material lifted may be readily deposited where it is accessible to workers on the job.

From the foregoing description it will be apparent that I have invented a novel portable 55 elevator which can be readily made and assembled and which is highly efiicient for its intended purpose.

Having thus described my invention, I claim:

1. In a portable elevator, a rectangular base having wheels thereon, converging support members on said base, a pair of upper transverse members connecting said support members adjacent the top thereof, said transverse members being spaced apart to form a slot, brace members for said support members, a pair of lower transverse members on said support members and spaced apart, a mast passing through said slot and between said lower transverse members, said mast having a pulley adjacent the upper end thereof, a trigger member pivotally mounted between said lower transverse members, said mast having a plurality of notches, said mast notches being adapted to receive the upper end of said trigger, spring means normally urging said trigger to en.- gaging position, means to move the trigger in a direction opposite to that. in which it is normally urged. by said spring means, means for raising and lowering the mast, a winch on said base, a pulley on the base and aligned with said winch, a cable on the winch and passing over said last mentioned pulley, said cable extending upwardly and passing over said mast pulley and thence extending downwardly and being adapted to engage an object to be lifted.

2. In a portable elevator, a base having casters thereon, a pair of upwardly directed converging support members on saidv base, a pair of upper transverse members connecting said support membersadjacent the top thereof, said transverse members being spaced apart. to form a slot, inclined brace members engaging one of said upper transverse members and said base, a pair of spaced lower transverse members on said. support members and spaced apart, a mast passing through. said slot and between said lower trans.- verse members, said mast having a pulley adjacent the upper end. thereof, a trigger member pivotall'y members, said mast. having av plurality of notches. said mast notches upper end of said trigger, spring means normally urging said trigger to engaging position, a flexible member connected to said trigger adjacent to the upper end thereof, a pulley adjacent to the trigger and receiving said flexible member, said flexible being adapted to receive the mounted between said lower transverse member extending downwardly from the last mentioned pulley and being adapted to move the trigger in a direction opposite to that in which it is normally urged by said spring means, means mounted on one of said upper transverse members for raising and lowering the mast, a winch on said base, a pulley on the base and aligned with said winch, a cable on the winch and passing over said last mentioned pulley, said cable extendin upwardly and passing over said mast pulley and thence extending downwardly and being adapted to engage an object to be lifted.

3. In a portable elevator, a rectangular base having a caster at each corner thereof, a pair of I upwardly directed converging support members on. said. base, a pair of upper transverse members connecting said support members adjacent the. top thereof, said transverse members bein spaced apart to form a slot, inclined brace members engaging one of said upper transverse members-and said base, a pair of spaced lower transverse membcrs connecting said; support members, a mast passing, through said slot and between said lower transverse members, said mast having a pair of spaced pulleys adjacent the upper end thereof, a trigger member pivotally mounted between said lower transverse members, said trigger member being made of wood and having a wear plate on the upper end thereof, said mast having a plurality of notches, said notches having wear plates therein, said mast notches being. adapted to receive the upper end of said trigger, spring means normally urging said trigger to engaging position, a flexible member connected to said trigger adjacent to the upper end thereof, a pulley adjacent to the trigger and receiving said flexible member, said flexible member extending downwardly from the last mentioned pulley and being adapted when pulled to move the trigger in a direction opposite to that in which it is normally urged by said spring means, means mounted on one of said upper transverse members for raising and lowering the mast, a winch on said base, a pulley on the base and aligned with said winch, a cable on the winch. and passing over said last mentioned pulley, said cable extending upwardly and passing over said mast pulleys and thence extending downwardly and being adapted to engage an object to be lifted.

GEORGE E, DAVIS. 

